In the foundations of thermal physics, there is a debate about whether the domain of thermodynamics and/or statistical mechanics can be extended to include gravitational systems. In this talk, I set aside black holes and consider the claim that thermal physics applies to Newtonian astrophysical contexts—in particular to self-gravitating systems such as elliptical galaxies and globular clusters. Whilst there is some success, notably the collisionless Boltzmann equation, there are many unusual features, such as negative heat capacity. Callender 2010 argues that in order to reconcile these two sides of the dispute we should take a broader, more liberal view of thermodynamics. I argue for an alternative position: if we are careful in distinguishing statistical mechanics and thermodynamics, then no reconciliation is required. Both sides can live in harmony because whilst statistical mechanics applies, thermodynamics does not